SL-4 R/B (11000)

COSPAR: 1978-077B | Alt Name: Soyuz-U No. 138 Blok-I
DECAYED

Image
SL-4 R/B Satellite Image
Additional Sources
Launch Details

Launch Date

August 7, 1978

Launch Pad

LC31

Launch Vehicle

Soyuz-U

Orbital Elements

NORAD ID

11000

International Designator

1978-077B

Decay Date

8/9/1978

Basic Satellite Info

Name

SL-4 R/B

Alternative Name

Soyuz-U No. 138 Blok-I

Type

Rocket Body

Status

Space Junk

Owner

RVSN

Country

USSR

Constellation

N/A

Related Satellites

Major Events

N/A

Summary
A rocket body, also commonly referred to as an upper stage or spent rocket stage, is the structural shell left behind after a rocket has delivered its payload to orbit. These large and often heavy pieces of space hardware can remain in orbit for years, posing significant collision hazards as part of the growing space debris problem. If left uncontrolled, rocket bodies have the potential to reenter Earth's atmosphere unpredictably, which can lead to falling debris in populated areas. Additionally, they risk colliding with operational satellites or the International Space Station, creating more debris and putting human life at risk.
Physical Characteristics

Length

6.7

Diameter

2.7

Span

6.7

Dry Mass

2350

Launch Mass

2350

Shape

Cyl

Radar Cross Section

Unknown

Visual Magnitude

Unknown

Color

Unknown

Material Composition

Unknown

Technical Details

Payload

11S510

Purpose

Unknown

Mission

Unknown

Manufacturer

PROG

Life Expectancy

Unknown

Bus

Blok-I

Configuration

Unknown

Motor

Unknown

Equipment

Unknown

Power System

Unknown

ADCS

Unknown

Transmitter Frequency

Unknown

Satellite Articles

View All Posts »

Learn more about satellites and other related topics.

Space Brief 14 Apr 2025

Space Brief 14 Apr 2025

Today's highlights include SpaceX's record-breaking Falcon launches, urgent warnings about orbital collisions, and a doubleheader launch featuring spy and Starlink satellites.

Space Brief 28 Nov 2024

Space Brief 28 Nov 2024

Today's briefing covers China's announcement of the Beidou system upgrade, launch updates for Vega C, challenges to global GPS reliability, and delays in the VERITAS Venus mission.

Orion Crew Returns After Historic Lunar Mission | KeepTrack Space Brief

Orion Crew Returns After Historic Lunar Mission | KeepTrack Space Brief

Artemis 2's four-person crew splashed down April 10 after first crewed lunar flyby since Apollo 17. Orion performance data critical for Artemis 3 south pole landing planning.

Space Brief 4 Apr 2025

Space Brief 4 Apr 2025

Today's highlights include the release of a mystery object by Russian military satellites, SpaceX Fram2 mission insights, Amazon's upcoming satellite launch, and more.

Space Brief 7 Aug 2025

Space Brief 7 Aug 2025

Today's brief covers significant developments in missile defense, military space operations, and upcoming rocket launches. Keep an eye on the evolving Golden Dome program and the advanced capabilities it brings.

SpaceX Launches 500th Starlink Satellite of 2026, Microsoft Partnership Announced | KeepTrack X Report

SpaceX Launches 500th Starlink Satellite of 2026, Microsoft Partnership Announced | KeepTrack X Report

SpaceX launches 500th Starlink satellite of 2026 on 540th reused booster flight. Microsoft partners with Starlink for rural internet expansion. NASA reveals first ISS medical evacuation details.

Space Brief 20 Mar 2025

Space Brief 20 Mar 2025

Today's brief highlights critical discussions in military space readiness, potential satellite 'dogfighting' scenarios, international defense collaborations, and a notable communications satellite launch.

X Report 23 Dec 2024

X Report 23 Dec 2024

SpaceX successfully launches 21 Starlink satellites from Florida, marking another milestone in its satellite internet constellation. The Falcon 9 rocket was also successfully recovered at sea.